Imagine if the Merge Actors tool knew which actors it merged, and would update when the source actors changed (ie, when you re-import a datasmith assy).
Imagine if the Merge Actor result could contain a list of objects it had merged, so if you forget one object, you can open it up again and add it to the merge, without having to re-do everything.
Imagine if you were able to select a pivot point for the Merge Actor tool to use.
That would make the tool way, way more useful in conjunction with Datasmith.
Either that, or you put some of the Merge Actors functionality into the magic special object that is the “datasmith scene” object.